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Gravity: the force that pulls objects towards Earth

Gravity: the force that pulls objects towards Earth. We are learning to: explain how gravity affects the motion of an object . We are looking for: gravitational pull causes objects to accelerate. . Free Fall: when the only force acting on the object is gravity.

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Gravity: the force that pulls objects towards Earth

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  1. Gravity: the force that pulls objects towards Earth We are learning to: explain how gravity affects the motion of an object. We are looking for: gravitational pull causes objects to accelerate.

  2. Free Fall: when the only force acting on the object is gravity • On Earth, the acceleration due to gravity is 9.8 m/s2 • For every second an object falls, its velocity increases by 9.8 m/s2 Speed (no air resistance) 0 m/s 9.8 m/s 1 sec 2 sec 19.6 m/s 3 sec 29.4 m/s

  3. Terminal velocity • In the real world, an object falls and accelerates due to two forces: gravity and air resistance • The man in the previous slide was continuously accelerating because the force of gravity was greater than the “air resistance” (unbalanced force) • What happens when the force of gravity equals the force of air resistance? The forces are balanced and the object is NOT accelerating. - But the object is still falling (at a constant rate)! This final velocity the object travels is called terminal velocity (the maximum velocity a falling object achieves) Object released from rest Forces on object during acceleration Forces on object at terminal velocity

  4. Weight on the moon • Our solar system is held together by gravitational forces • What is the largest planet/object in our solar system? • The gravitational pull depends on the mass of the planets and the distance between them. • On Earth, our weight (the force) is equal to: F=ma • F = force due to weight • m = mass • a = acceleration due to gravity on the planet • On the moon, our weight (the force) is equal to: F=ma • Moon = 1.6 m/s2 Earth = 9.8 m/s2 • Compare your weight on Earth with your weight on the moon…why is it the same or different?

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